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I was reading up on quadrant switches and need your with some points.
I was using this text: http://ecee.colorado.edu/~ecen5797/course_material/Ch4slides.pdf
(or, use Google drive PDF: https://drive.google.com/file/d/168CHus1Rzm4fCViEJdFnOA845f_R3PsN/view?usp=sharing)